I don't use a special bra....I just pull the stretchy cups of my nursing bra down (leaving them clipped) and use the stretch to hold the pumping flanges. I wouldn't do jumping jacks, but definitely fine for email! Of course I spent like $70 trying Simple Wishes and whatever the other one is-- turns out I hate them. So no money saved here....
I cut holes in a wireless sports-ish type bra. I am drinking water, posting on mm, uploaded some pictures to Facebook, and am 15 minutes in without wanting to kill myself.
I did this in the hospital, and my mom thought I was crazy.